oss-security - Information Leak in mincore() in the Linux Kernel CVE-2017-16994

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Message-ID: <20171127201920.GZ21404@suse.de>
Date: Mon, 27 Nov 2017 21:19:20 +0100
From: Marcus Meissner <meissner@...e.de>
To: OSS Security List <oss-security@...ts.openwall.com>
Subject: Information Leak in mincore() in the Linux Kernel CVE-2017-16994

Hi,

Mitre has allocated CVE-2017-16994 for this bug found by Google P0 team member jannh.

The walk_hugetlb_range function in mm/pagewalk.c in the Linux kernel before 4.14.2 mishandles holes in hugetlb ranges, which allows local users to obtain sensitive information from uninitialized kernel memory via crafted use of the mincore() system call.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-16994
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=373c4557d2aa362702c4c2d41288fb1e54990b7c 
https://bugs.chromium.org/p/project-zero/issues/detail?id=1431

Ciao, Marcus

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